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Rain525623
@Rain525623
July 2022
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Вычислите:
a) cos (-570)
b) ctg 495
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mikael2
-570=720-570=150=180-30 cos(180-30)=-cos30=-√3/2
495=360+135=90+45 ctg(90+45)=-tg45=-1
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495=360+135=90+45 ctg(90+45)=-tg45=-1